Heat-dissipating fan and its housing

Abstract

A heat-dissipating fan with an upward air-guiding member is provided. The heat-dissipating fan includes a housing, an impeller having a hub and a plurality of blades disposed around the hub, a base disposed inside the housing for supporting the impeller thereon, and an air-guiding member disposed between the base and the housing, wherein the air-guiding member has at least one inclined edge on the windward side or its opposite side relative to the horizontal line perpendicular to the axis of the heat-dissipating fan.

1. A heat-dissipating fan comprising:
 a first housing having an outwardly expanding part and a cylindrical part; 
 a first impeller having a hub and a plurality of blades arranged around the hub; 
 a base disposed inside the housing for supporting the first impeller; and 
 an air-guiding member disposed between the outwardly expanding part and the base, having a first edge with a first inclined angle relative to a line perpendicular to an axis of the heat-dissipating fan, wherein the first housing, the base and the air-guiding member are integrally formed to be a single piece and the air-guiding member has one end connected to the base and the other end connected to inner walls of the cylindrical part and the outwardly expanding part. 
 
   
   
     2. The heat-dissipating fan according to  claim 1 , wherein the air-guiding member has a second edge located opposite to the first edge and having a second inclined angle relative to the line. 
   
   
     3. The heat-dissipating fan according to  claim 2 , wherein the first or second inclined angle is ranged from 3° to 45°. 
   
   
     4. The heat-dissipating fan according to  claim 2 , wherein at least one blade of the impeller has an edge with a third inclined angle relative to the line. 
   
   
     5. The heat-dissipating fan according to  claim 4 , wherein at least one blade of the impeller has an opposite edge with a fourth inclined angle relative to the line. 
   
   
     6. The heat-dissipating fan according to  claim 5 , wherein the third or fourth inclined angle is ranged from 3° to 45°. 
   
   
     7. The heat-dissipating fan according to  claim 5 , wherein the first inclined angle is relatively greater than or less than the second inclined angle, and the third inclined angle is relatively greater than or less than the fourth inclined angle. 
   
   
     8. The heat-dissipating fan according to  claim 1 , wherein the air-guiding member is positioned on an air inlet or an air outlet of the heat-dissipating fan. 
   
   
     9. The heat-dissipating fan according to  claim 1 , wherein the air-guiding member has a central part with a thickness relatively greater or smaller than those of two opposite ends thereof. 
   
   
     10. The heat-dissipating fan according to  claim 1 , wherein the blades have a curved or wing-like cross-section with an inclined angle ranging from 15° to 60° relative to the axis of the heat-dissipating fan. 
   
   
     11. The heat-dissipating fan according to  claim 1 , further comprising a driving device mounted inside the hub for driving the first impeller. 
   
   
     12. The heat-dissipating fan according to  claim 1 , wherein the blades of the first impeller respectively have an upper inner edge positioned at an interface between an inclined or arc structure and a vertical portion of the hub. 
   
   
     13. The heat-dissipating fan according to  claim 1 , wherein the blades of the first impeller respectively have a lower inner edge relatively higher than a bottom end of a vertical portion of the hub. 
   
   
     14. The heat-dissipating fan according to  claim 1 , wherein the first housing includes a cylindrical part and the air-guiding member has one end connected to the base and the other end connected to an inner wall of the cylindrical part. 
   
   
     15. The heat-dissipating fan according to  claim 1 , further comprising a second impeller with a hub and a plurality of blades disposed around the hub and axially arranged with the first impeller in series. 
   
   
     16. The heat-dissipating fan according to  claim 15 , further comprising a second housing for receiving the second impeller therein. 
   
   
     17. The heat-dissipating fan according to  claim 15 , wherein the second housing is assembled with the first housing by screwing, engaging, riveting or adhering. 
   
   
     18. The heat-dissipating fan according to  claim 15 , wherein the second housing is integrally formed with the first housing as a monolith piece by injection molding. 
   
   
     19. A heat-dissipating fan comprising:
 a first housing having an outwardly expanding part; 
 a first impeller having a hub and a plurality of blades arranged around the hub; 
 a base disposed inside the housing for supporting the first impeller; and 
 an air-guiding member disposed between the outwardly expanding part and the base, having a first edge with a first inclined angle relative to a line perpendicular to an axis of the heat-dissipating fan, and having a gradually increasing or decreasing cross-section area from the base toward the first housing, wherein the first housing, the base and the air-guiding member are integrally formed to be a single piece.